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Auger decay, spin exchange, and their connection to Bose-Einstein condensation of excitons in Cu2O

Abstract : In view of the recent experiments of O'Hara et al. [Phys. Rev. B 60, 10 565 (1999) and Phys. Rev. B 60, 10 872 (1999)] on excitons in Cu2O, we examine the interconversion between the angular-momentum triplet-state excitons and the angular-momentum singlet-state excitons by a spin-exchange process that has been overlooked in the past. We estimate the rate of this particle-conserving mechanism and find a substantially higher value than the rate of the Auger process considered so far. Based on this idea, we give a possible explanation of the recent experimental observations, and make certain predictions, with the most important being that the singlet-state excitons in Cu2O is a very serious candidate for exhibiting the phenomenon of Bose-Einstein condensation.
keyword : excitons
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https://hal-polytechnique.archives-ouvertes.fr/hal-00465589
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Submitted on : Friday, March 19, 2010 - 10:37:45 PM
Last modification on : Wednesday, May 11, 2022 - 3:22:04 PM

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G.M. Kavoulakis, André Mysyrowicz. Auger decay, spin exchange, and their connection to Bose-Einstein condensation of excitons in Cu2O. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2000, 61 (24), pp.16619. ⟨10.1103/PhysRevB.61.16619⟩. ⟨hal-00465589⟩

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